MDaemon incorporates multiple layers of security techniques such as Relay Controls, IP Shielding, SMTP Authentication, and reverse lookups to minimize possible server exploits. It uses the advanced email authentication techniques of Vouch By Reference (VBR), and validates and signs messages using DKIM, DK, Sender-ID, and SPF. It is combined with its antispam engine, Bayesian Learning, SSL/TSL and backscatter protection. Seamless integration with AntiVirus for MDaemon (separately licensed plug-in)